Bandwidth / Download Time Calculator
Estimate how long a file will take to download at a given connection speed — instantly, in your browser.
Estimate how long a file will take to download at a given connection speed. Everything runs entirely in your browser.
How it works
Enter a file size and a connection speed, in whichever units you have them, and this tool converts both to bits and divides to estimate download time. Speeds use decimal (1000-based) units, matching how ISPs advertise connection speeds and how most operating systems report transfer sizes.
FAQs
Why does my actual download take longer than the estimate?
This is a theoretical estimate based on your stated connection speed alone — real downloads are also affected by network congestion, server-side limits, protocol overhead, and other traffic sharing your connection.
Is my data sent anywhere?
No. The calculation happens entirely in your browser.